<template>
	<view>
		<search @click="gotoSearch()"></search>
		<view class="scroll-view-container">
			<!-- 左侧的滚动视图区域 -->
			<scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
				<block v-for="(item,i) in cateList" :key="i">
					<view :class="['left-scroll-view-item',i===active ? 'active' :'']" @click="activeChanged(i)">
						{{item.cat_name}}</view>
				</block>
			</scroll-view>
			<!-- 右侧的滚动视图区域 -->
			<scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}">
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<view class="cate-lv2-title">
						{{item2.cat_name}}
					</view>
					<view class="cate-lv3-list">
						<navigator class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" :url="'/subpkg/goods_list/goods_list?cid=' + item3.cat_id">
							<image :src="item3.cat_icon"></image>
							<text>{{item3.cat_name}}</text>
						</navigator>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				//窗口的可用高度=屏幕高度-navigationBar高度
				wh: 0,
				//分类数据列表
				cateList: [],
				//当前选中项的索引，默认让第一项选中
				active: 0,
				//二级分类列表
				cateLevel2: [],
			};
		},
		onLoad() {
			this.getWindowHeight(),
				this.getCateList()
		},
		methods: {
			getWindowHeight() {
				const sysInfo = uni.getSystemInfoSync()
				this.wh = sysInfo.windowHeight-55
			},
			async getCateList() {
				const {data: res} = await uni.$http.get("/api/public/v1/categories")
				if (res.meta.status !== 200) return uni.$showMsg()
				this.cateList = res.message
				this.cateLevel2 = res.message[0].children

			},
			//在一级分类选中项改变之后，为二级分类列表数据重新赋值：
			activeChanged(i) {
				this.active = i
				//为二级分类列表重新赋值
				this.cateLevel2 = this.cateList[i].children
			},
			gotoSearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		},
		 
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;
		.left-scroll-view {
			width: 120px;
			.left-scroll-view-item {
				line-height: 60px;
				background-color: #f7f7f7;
				text-align: center;
				font-size: 12px;
				// 激活项的样式
				&.active {
					background-color: #ffffff;
					position: relative;
					// 渲染激活项左侧的红色指示边线
					&::before {
						content: ' ';
						display: block;
						width: 3px;
						height: 30px;
						background-color: red;
						position: absolute;
						left: 0;
						top: 50%;
						transform: translateY(-50%);
					}
				}
			}
		}
	}
	.cate-lv2-title {
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}

	.cate-lv3-list {
		display: flex;
		flex-wrap: wrap;
		.cate-lv3-item {
			width: 33.33%;
			margin-bottom: 10px;
			display:flex;
			flex-direction: cloumn;
			align-items:center;
			image {
				width: 60px;
				height: 60px;
			}
			text{
				font-size:12px;
			}
		}
	}
</style>
